NOIDA: Two firefighters were killed and three others injured after a wall and an iron beam collapsed while they were battling a massive fire at an electronic chip manufacturing unit in Noida late Monday night, police said on Tuesday.The incident occurred late Monday night at the ILGIM company in the Ecotech-3 industrial area, where at least six fire brigade vehicles were rushed after information about the blaze was received.The firefighters were attempting to douse the blaze when a wall and an iron beam inside the factory suddenly collapsed, injuring five of them, the spokesperson said.All five injured firefighters were rushed to a nearby hospital. Rohit Yadav and Tirathpal Singh succumbed to their injuries during treatment, while Rajpal Singh, Manish Kumar and Amit Kumar are undergoing treatment and are stated to be out of danger, police said.Senior police officials, along with teams of the State Disaster Response Force (SDRF), reached the spot and supervised the rescue operation as firefighting efforts continued.Police said the exact cause of the blaze is yet to be determined and an investigation has been launched. Necessary legal action is being taken in connection with the incident, officials added.(With PTI inputs)